Thread cutting shuttle



Aug. 29, 1933. ATCEDERLUND THREAD CUTTING SHUTTLE Filed Feb. 20. 1931 50 LJHO n W '3 17v VE/V TOR D M m m C T x m B A Patented Aug. 29, 19 33 UNIT D STA TBS PATEN ol FIcEj.

This invention relates to shuttles constructed to'cut the thread of the outgoing bobbin at the draw this end anda part of the mechanism for 5 as the latteru'nwinds inweaving; but positioned v ,1 particular form of shuttle -tension,-but,, the depressed at the time theerihausted-bobbin is V issue. from a delivery; eye 12 of usualfform. Itis a furtherobjectof my invention to provide two cutting edges so related to each other J that 'a thread when being-"drawn downwardly} at the time of transier'willbe caused-'to move.

time of transfer and it is the-general 'object of the invention to provide such a shuttle having the 'cutting edges so arranged'as' to insure a drawing of the weft across sharp edges' due to the outgoing movement of the bobbin. In weft replenishing looms wherein the bobbins are changed it is customary to expel the exhausted bobbin by *means'off incoming full supply of weft. Where feeler mechanisms are employed there is usually a thread end extending from an exhausted bobbin through the shuttle eye, back along the front wall of 'the'shuttle to the adjacent selvage. It is necessary to withaccomplishing this result usually involvessome form of thread parter. It is an importantobject of my present invention to efiect'the thread parting by means located'fin thei{shuttleand disposed with respect tdthe threadpassage.

as to be normally out ofjthepath of the weft to lie in the path of the weft as the'latter is pushed downwardly andout of the shuttle.

over two surfaces at least one of which is sharp.

It a still further "object of my invention toprovide the passage in the shuttle eye with an auxiliary restricted chamber the sides of. which act as guards to keep the thread from engaging the cutting edgesunder normal conditions, said auxiliary, passage being of sufiicient d width only from the bottom'of the shuttleftoward the ad- 'jacent "shuttle tip without .materia'lly weakening the cross section of the shuttle. 1

At the instant of transfer there may develop aslight jamount of slack. which permits the movement of the weft awayfrom the cutting edge carried'by the shuttlef It is a further object of my invention to employ a slackto take-' up shuttle eyes which will serve to hold the weft a by t i p t e slack, thus requiring the thread to be drawn over the sharp edges,

'Fig.-4-is'a detail of onepf the cutter plates; V u I? a mFig. 5'is adiagrammaticIiragmentary view: 7

showing the relation between the-weft andthe .cutter at: the time oftran' sfer.

,thethread. I'he". left hand endsfof the particular plate shown in Fig. 4 has asinuous sharpened edge 23 formed withupp'er andlower prowhichilies a recess 26. v p x i 7 Both of the cutters are substantially the 100 Withgthese and. other objects in'view which. will appear as the descriptionproceeds; my in-;

"vention resides the combination "and ar- ;shown in ;Fig. -2, but it is desirable that they In the accompanying drawing, wh trein a convenient embodiment of my invention is-set forth,

Fig. 1 is atop plan view of one endof shuttle made according to. my present invention Fig. 2 is an enlarged vertical section on;line

Fig; 3:. is anlenlarged vertical section fon line Referring to; the drawing; the shuttle fil has a weft chambei' lO in which is located the ordinary bobbin B havin a;weft supply- -Extending from thechamberlo is the usual-thread passage llawhich as set' forth herein may have to 'Hutchins No. 1,723,423.; operation of my invention does not depend primarily .upon any thread, after passingthrough.thef tension; may

The. floor of the thread passage is designated at 13 and. will ordinarily be a substantial .dis-

tance abOVQthB bQtt Om 'Of the shuttle, v

In applying my; invention to the form of stantially similar cutting plates designated-herein at 20 and 21; being located on the right-and edge 2201? which -.may be inclined downwardly and-towardthe centerof the shuttle andp'referably blunt sofas to have no cuttingjaction on tuberances 24 and 25, respectively, between same and, can be 'mountedv as suggested in Figrz [1, being held in place by screws or other means.

A'spacer 27 may be 'employe'dinj connection with one of the plates to hold 'the'samea short distancefromthe other plate. When assembled as. 5 shown in Fig.2 the protuberances 24 of:,ea'ch" plate'willlie in v approximately the same horizontal planeandthis is'also .true'of the lower parts. 25. The. recesses 26 maybe disposed as a formofpgtensionsuch as that .shownin patent?- ;shuttlesetforth hereinl employ a pair ot sub-' theprotuberances overlap each other; as 'illusoverlap slightly so that at no time in the downward movement of the thread will the latter be free from a bending condition induced by engagement with the cutting'edges.

A small slot or recess 30 extends vertically downwardly from the bottom 13 and has an.inclined floor 31 which, as shown in Fig. .3, may start near the lowerprotuberance and slant upwardly and. toward the adjacent shuttle tip.

The recess is preferably of a width equal to.

or only slightly more than the amount by which trated in Fig. 2. This relation is not absolutely necessary but is convenient Thatpart'ofthe hour 13 which is adjacent the, blunt v-edges-"22 may be located slightly above the latter so that should any burr or sharp edge happen-to re} :main along the edges 22 said floor of the passage ll will be sufiiciently high to act as a guard and prevent the thread from engaging the burr or the like; Ifcare is taken to round that part of -edge'22 Whichfaces'theweft chamber'lO-the guarding relation mentioned'will not be necessary; I a

. In operatiomwhen the bobbin has a suflicient I supply of weft, it will extend-in a'dire ction parallel to. the axis of V the shuttle-and...will. unwind over the tip of the. bobbin: .3 and enter the'thread passage 11; Weft ordinarily balloons somewhat when unwindingrapidlyand moves along a curved path which thside walls of the 'passage llx As the weft -is on the under side of its path of movement merges -.with

when being unwoundfrom the bottom of the bobbin; it will slide along the previously referred to'guarding-portions of the floor 11, or may slide over properly smoothed or rounded edges 22. Inany event, theparts'willbe' s0 p p tionedl that the previously described cutting edges will normallyibe out of the path 'of' move- "ment of the weft as the shuttle ,isin flight.

the time "of transfer well-known mecha- "h ism will operate to depress thebobbin so that the same'will move'from the full to the'dotted lineposition indicated in Fig.3. The weft will be-guided down one or" the other of the oppositely inclined'edge's 22 and will enter the small recess 30; As the bobbin: continues to move downwardly the weft-will be dragged .over the cutting edges --of both plates 20 and 21,- The contours of these cutting, edges are such as torequire the thread to bebent as shown inFig. 5.

An important feature of the invention relates to the draw-back tension in the shuttle eye;

The Hutchins shuttle previously referred to includes two tension arms 40 and 41; respectively,

held norrha-llyapart by an elastic, such as a r-ubher band 42. The inclined-parts of the arms defined a notch into *whichthe weft of the freshly transferred bobbin-is directed. Durtingshuttle flight the' arms are believed-to be stressed'and to remainso as the shuttle comes to rest. The elastic is therefore capable of "asit passes overthe cutting edges.

From the foregoing it will be seen that downward movement of the bobbin insures a sliding contact of the weft, along a zigzag or sinuous "path definedby two'sharp'edges withthe result that the weft is out .by the mov'e'ment which is 7 it Tg'ivenfit at the time the bobbinis transferred;

*5 als the cutting edges are g"'u ar ded and the 'small' vertical rece'ss with the inclined"b"ott6m extending from an outgoing bobbin;

qof longitudinally}spaced cutters ach'fhaving -a produce, a bend in a weft extending frorn 'they-m5 moving the arms to take up any slack which might occur at transfer and hold the weft-taut aids the weft to move to cutting position. Furthermore, .the draw-back tension helps to maintain thev weft taut as it movesover the knives. Having thus describedmyinvention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I 'do not lwish" to be limited to the details herein disclosed, but what I claim is: I i 1. In a threadcutting shuttle having a'bobbin chamber and an eye thread passage, a pair 'of stationary overlapping oppositely facing cut-.

ting edges between the passage and chamber and flocatedbelowlthe center of the shuttle'to engage and seven-the weft of an outgoing bobbin.

2.'In"a thread 'cutting shuttle having a bobbin chamber indanjieye thread passage, a pair of oppositely facing cutting surfaces spaced longitudinally with respect to the shuttle and overlapping transversely of the shuttle, said cutting edges located in the path of a weft V :3. In anthread cutting shuttle having 'ahObbin chamberand. an eye threadpassage, apair sinuous cutting edge, saidcuttingedges over.-

' lapping each other in a directiontransver'sely of the shuttle, the ed ges fbeing so disposed as to thread passage; to a *bobbin -leavingothe bobbin chamber 9. I h

Ina thread cutting shuttle having a bobbin chamber and an eye threadpassajge "the thread passagehaving a floor located in the floorof the thread passage an'dithe {bottom of the shuttleand hayingportions 'which overlap ,5'. Ina thread cutting snutnhavi-ng a batbin chamber and ian eye thread-passage, the

thread passagehavinga floor located in thebot- ,tom of the shuttle; and apair oflbngitudinally spaced cutting edges both: located between' the floor of the thread, passage fan'dfthe' bottomof the shuttle and having' 'portion's'iwhichioverlap transversely of theshiittle and: positioned to ell-'3; "gageia weft 'extending from a threadpas'sageitoan outgoing bobbin, the floor of'ithe th'read'passage having a restricted recess "which is in'fsubstanti al longitudinal alignmentwith-Ithebutting edges.

bottom ofthe shuttle, and a pair 6r longitudinal-. ly spa'ced cuttingedg'es both located' between'the transversely ofthe shuttle and positionedrto engage a eft extendingfrom athr'eadpas'sag'e'to anoutg oin gbobbin.

s. In a. thieadl ciittmg shutuqiiavifig a. Hebbin. chamber and an eye; thread passage, the thread passage having a, fiobrjlocated inrthe. bottom of -the shuttle, and; a pair bf longitudinal ly. spaced cutting edges biith located between the? floor of '7 the; were pas's"age and the-b 'tom' I'of the. shuttle and -havii g portions which overlap trans versely ofthe shuttle and positioned toengage a -wefte tnding from the thre'ad'p'as'sage to an outgoing bobbing Ithefioorpf the thread; passage having a 'iest'ricted' recesswmems in substantiallongitudinal. alignment with 'thecutting edges and' terinihates at a'point [above said cutting edges.

I 7. In a threadbu'tting 'shuttlehavingabobbin chamber and an eye ffthre'ad' passage; the 1 threadpassagehaving" affloor locat'd in'the bot tom of the shuttle a'n'd' a'p'air of longitudinally spaced "cutting edges xboth located Tbtween the floor of the thread passage and 'thelbottom0125i the shuttle and having 'portions' which overlap transversely of the shuttle and positioned to engage the weft extending from the thread pas sage to an outgoing bobbin, the floor of the thread passage having a restricted recess which is in substantial longitudinal alignment with the cutting edges and extends from a point adjacent the bottom 01' said cutting edges to a point above the latter.

8. In a thread cutting shuttle having a weft chamber to hold a bobbin, a draw-back tension for the weft, and a stationary cutter on the shuttle located between the chamber and tension, and operative at the transfer of a bobbin to cut the filling extending from said bobbin as the latter moves from the weft chamber.

having a. cutting edge; and the other member overlapping the cutting edge with respect to the path of the weft to produce a cutting action on the outgoing welt by movement of the latter.

ALBERT CEDERLUNDQ 

